/Rb-87/-/Sr-87/ dating of LL chondrites

Details /Rb-87/-/Sr-87/ dating of LL chondrites /Rb-87/-/Sr-87/ dating of LL chondrites

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..56...89m&link_type=abstract

Earth and Planetary Science Letters, vol. 56, Dec. 1981, p. 89-106.

Computer Science

11

Chondrites, Meteoritic Composition, Rubidium Isotopes, Strontium 87, Chemical Analysis, Data Acquisition, Mass Ratios, Rocks, Meteorites, Ll Chondrites, Dating Methods, Isotopic Ratios, Rubidium, Strontium, Samples, Meteorite, Laboratory Studies, Chainpur, Soko Banja, Guidder, Jelica, Ensisheim, Chondrules, Isochrons, Metamorphism, Siena, Comparisons, Procedure, St. Severin, Krahenberg, Parent Bodies, Age

Scientific paper

(Rb-87)-(Sr-87) analyses are presented for a series of LL chondrites. Ten whole rock meteorites from the set define an isochron age of 4.486 plus or minus 0.020 Ga and initial Sr-87/Sr-86 ratio of 0.69887 plus or minus 0.00012, in agreement with H- and E-type chondrite results. Analyses for Soko Banja (LL4) chondrules yield an isochron of age 4.452 plus or minus 0.020, and a strontium initial ratio of 0.69954 plus or minus 0.00024. No isochron could be derived for the Chainpur (LL3) chondrule, and only a poor one for the Jelica (LL6) density separate, due to terrestrial alteration or to a late isotopic disturbance of the meteorite. The (Rb-87)-(Sr-87) system is also disturbed in the Guidder (LL5) chondrules and Ensisheim (LL6) density separate, perhaps as a consequence of shock. A discussion is given of these results in relation with thermal metamorphism in the LL chondrite parent bodies.

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